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macvtap: zerocopy: validate vectors before building skb
authorJason Wang <jasowang@redhat.com>
Wed, 2 May 2012 03:42:15 +0000 (11:42 +0800)
committerMichael S. Tsirkin <mst@redhat.com>
Wed, 2 May 2012 15:22:21 +0000 (18:22 +0300)
commitb92946e2919134ebe2a4083e4302236295ea2a73
tree46887b70dd309f7bdd358f32b47b0aee766788d3tree | snapshot (tar.gz zip)
parent01d6657b388438def19c8baaea28e742b6ed32eccommit | diff
macvtap: zerocopy: validate vectors before building skb

There're several reasons that the vectors need to be validated:

- Return error when caller provides vectors whose num is greater than UIO_MAXIOV.
- Linearize part of skb when userspace provides vectors grater than MAX_SKB_FRAGS.
- Return error when userspace provides vectors whose total length may exceed
- MAX_SKB_FRAGS * PAGE_SIZE.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
drivers/net/macvtap.c diff | blob | blame | history